US4782544A - Water extraction method and control for automatic washer - Google Patents

Water extraction method and control for automatic washer Download PDF

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Publication number
US4782544A
US4782544A US07/039,321 US3932187A US4782544A US 4782544 A US4782544 A US 4782544A US 3932187 A US3932187 A US 3932187A US 4782544 A US4782544 A US 4782544A
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United States
Prior art keywords
basket
speed
moisture
level
acceleration
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Expired - Lifetime
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US07/039,321
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English (en)
Inventor
Arne M. Nystuen
David W. Mundy
John M. Kuss
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Whirlpool Corp
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Whirlpool Corp
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Priority to US07/039,321 priority Critical patent/US4782544A/en
Assigned to WHIRLPOOL CORPORATION, (A CORP. OF DE) reassignment WHIRLPOOL CORPORATION, (A CORP. OF DE) ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KUSS, JOHN M., MUNDY, DAVID W., NYSTUEN, ARNE M.
Priority to CA000563985A priority patent/CA1306367C/fr
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/40—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D06F2105/48—Drum speed
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/30—Driving arrangements 
    • D06F37/304—Arrangements or adaptations of electric motors

Definitions

  • the present invention relates to a control and method for extracting water from a clothes load within an automatic washer.
  • the speed at which the clothes basket is spun is a balancing of several factors.
  • Automatic washing machines manufactured by Whirlpool Corporation, the assignee of the present application have a top spin speed in the range of 600-700 rpm, in that it has been determined that higher spin speed causes excessive wrinkling.
  • a common prior art method of spinning the basket incorporates an AC motor which, through an appropriate transmission and gearing quickly accelerates the basket up to a constant speed level which is maintained throughout the entirety of the extraction step for a predetermined length of time.
  • U.S. Pat. No. 2,975,902 discloses a horizontal axis washer in which the spin speed is increased in small predetermined increments from a normal tumbling speed up to the speed at which the clothes become plastered against the drum wall in order to effect a desired distribution of the clothes around the drum wall. Once the clothes have become plastered against the wall, the spin speed is then increased rapidly to a maximum spin speed.
  • U.S. Pat. No. 3,403,538 discloses the use of a controlled spin operation in which the spin speed is prevented from rising above 300 rpm during a first phase of spin, but is permitted to increase to a speed between 300 rpm and 1000 rpm during a second phase of spin if an unbalanced load was not detected as the spin tub passed through its critical speed. If an unbalanced condition is detected as the spin tub passes through critical speed, the spin speed is maintained below 300 rpm.
  • U.S. Pat. No. 3,425,559 discloses an automatic washer having a single speed motor and a two-speed transmission, along with control means for maintaining the transmission and low speed setting during the initial portion of the spin to reduce the load of the motor. Once the motor speed reaches a certain percentage of its maximum speed, the transmission is shifted into its high speed mode, thereby increasing the spin speed to its maximum. This is done to prevent stalling of the motor at the start of a spin cycle of operation.
  • U.S. Pat. No. 3,526,105 discloses the desirability of keeping the spin speed low to maintain good performance when laundering permanent press fabrics.
  • the disclosed control operates a pump at high speed during an extraction portion of the wash cycle and operates the motor, which effects rotation of the fabric basket, at a high speed until a portion of the liquid has been removed, which is sensed by a level sensing switch, at which time the motor will be energized at a slower speed through the remainder of the extraction portion of the cycle. It is stated that the full tube of water prevents high rotation speed of the inner basket when the motor is energized at a high speed.
  • U.S. Pat. No. 4,513,464 discloses the idea of providing controlled acceleration to the drum of a centrifugal extractor to minimize unbalance problems.
  • the speed of the drum is held constant until the amount of load unbalance drops below a certain level, after which the speed is increased and the unbalance is again measured.
  • This patent also discloses the idea of measuring the difference between successive unbalance measurements, for the purpose of controlling the speed of the drum.
  • the present invention provides a method and control for extracting water in an automatic washer in which the speed of rotation is started out at a low level and is incrementally increased, to reduce the amount of wrinkling in the clothes load while eventually obtaining as high or higher level of moisture extraction as has been common in the past.
  • the basket is spun at a low speed level until all of the moisture extractable at the low speed level has been extracted and then the basket is spun at a somewhat higher speed level, again until all of the moisture that can be extracted at the higher speed level has been extracted. This process of incrementally increasing the spin speed is continued until a desired level of moisture extraction has occurred.
  • the extent of liquid extraction at each speed level is measured by sensing and comparing successive basket acceleration times. That is, at each speed level, the basket is caused to accelerate and decelerate repeatedly, between a low limit speed and a high limit speed, and the duration of each successive acceleration step is measured, while a constant motor torque is applied to the basket.
  • the amount of water extracted since the previous acceleration is indicated by a difference in the time required to achieve the high limit speed, the difference in times between successive steps being caused by a difference in the inertia of the clothes load, and the change of inertia being directly related to the amount of water extracted.
  • acceleration times are equal between successive acceleration steps, no additional water will have been extracted.
  • the control When equal acceleration times are sensed, the control then causes the motor to operate at the next higher rotational speed level or range, between a preset lower limit and a preset upper limit speed. Again, the motor is periodically accelerated from the low limit to high limit speeds and is caused to decelerate again to the low limit speed so that successive acceleration times may be measured.
  • the force applied to the clothes within the basket during spin is considerably reduced, particularly during the early stages of the spin cycle thus providing enhanced performance and reduced wrinkling.
  • the spin cycle can be terminated when the desired level of water extraction has been sensed, which time is related specifically to the particular clothes load being laundered rather than a preset and predetermined time period.
  • a water extraction level equal to the presently achievable extraction level can be obtained while applying a substantially lower force on the clothes load thus resulting in considerably less wrinkling of the clothes.
  • a higher level of extraction can be achieved than is available in the present commercial production models while again applying a lesser force on the clothes load and thus a reduction in the wrinkling.
  • FIG. 1 is a perspective view of an automatic washer in which the principles of the present invention can be employed.
  • FIG. 2 is a schematic illustration of the inertia loads in the drive system of the washer of FIG. 1.
  • FIG. 3 is a graphic illustration of rotational speed of the basket during an extraction process embodying the principles of the present invention.
  • FIG. 4 is a schematic illustration of an automatic washer control for operating a motor in accordance with the principles of the present invention.
  • FIG. 5 is a flow chart illustration of the steps undertaken in a method embodying the principles of the present invention.
  • FIG. 6 is a graphic illustration comparing basket rotational speed, force applied to the clothes load and water extraction between the present available commercial washing machines and a washing machine embodying the principles of the present invention.
  • FIG. 1 there is illustrated a vertical axis washer generally at 10 having an outer cabinet 12 enclosing a washer mechanism supported on legs 14.
  • the washer mechanism includes an imperforate wash tub 16 with a concentrically carried perforate wash basket 18 and a central vertical axis agitator 20.
  • the agitator 20 and basket 18 are driven by means of an electric motor 22 through an appropriate transmission 24.
  • the interior of the wash basket 18 is accessed through an openable lid 26 and a plurality of manually operated controls 28 are provided on a console 30 at a top rear of the washer 10.
  • a console 30 at a top rear of the washer 10.
  • FIG. 2 schematically illustrates sources of inertia in the moving parts of the washer during the spin extraction portion of the wash cycle.
  • Box 32 signifies the inertia of the motor and drive shaft of the motor.
  • Boxes 34 represent drive friction primarily in the bearings of the motor and drive shaft.
  • Boxes 36 represent the gears connecting the motor with the basket which can comprise either a direct gear connection or a belt and pulley connection.
  • Boxes 38 represent bearing friction associated with the basket and agitator and box 40 represents the inertia of the machine, that is inertia of the basket, agitator and spin tube.
  • box 42 represents inertia of the load carried within the basket.
  • the inertia of the elements represented by boxes 32 through 40 remains constant at any given rotational speed. Only the inertia of the load, represented by box 42, changes during a spin operation. This inertia changes because the amount of water retained in the load decreases during spin. If the inertia of the load 42 does not change within a given time period then this means that the amount of water extracted has not changed.
  • the present invention utilizes this changing inertia of the load as a means for detecting the amount of water extracted during any given time period.
  • FIG. 3 illustrates one embodiment of the invention in a graphic form depicting rotational speed of the basket versus time.
  • a first low limit speed W1 and a first high limit speed W2 for the basket are predetermined.
  • the motor is energized to accelerate the basket up to the first lower limit speed W1 as an initial starting point.
  • the basket speed is accelerated from the first low limit speed W1 to the first high limit speed W2 and the time required to accelerate to the first high level speed W2 is measured. This is represented by times T o as the initial time and T 1 as the final time.
  • the basket speed is then allowed to declerate down to the initial low limit speed W1 and, upon achieving that speed, is again accelerated up to the high limit speed W2.
  • the two time periods, that is T 3 - T 2 and T 1 - T o are compared and, if significantly different, the basket is caused to decelerate again to the initial low limit W1 where it is again accelerated up to the high limit W2 and the time required for acceleration measured.
  • the new time period T 5 - T 4 is compared with the most recent measured time period, that is T 3 - T 2 and, if there is a significant difference, the same steps would be repeated.
  • the two time periods T 5 - T 4 and T 3 - T 2 are substantially identical, thus indicating that the acceleration time is the same and, therefore indicating that the inertia of the load is the same.
  • the basket is then caused to accelerate up to a new low limit speed W3 as an initial point from where it is accelerated up to a new high limit speed W4 and the time required for such acceleration, T 7 - T 6 is measured. Again, the basket is then caused to decelerate to the new low limit speed W3 from where it is caused to reaccelerate up to the high limit speed W4.
  • the clothes load is first rotated at a relatively low first speed level until virtually all of the moisture extractable at that rotational speed level has in fact been extracted. Only then is the basket accelerated up to a second speed level and maintained at that level, until virtually all of the moisture extractable at that speed level has been extracted. Such an incremental increase in speed levels is continued until a predetermined speed level is attained which represents a desired level of moisture extraction. Once it has been determined that all of the moisture has been extracted at the predetermined highest speed level, then the spin step of the wash cycle is terminated.
  • FIG. 4 illustrates circuitry which can be utilized as a control for achieving the various levels of low limit and high limit speeds of the motor as illustrated in FIG. 3.
  • a source of alternating current is supplied to lines 50, 52 which are connected to a full wave bridge rectifier 54 to provide a DC voltage on line 56 to a motor 58.
  • a diode 60 is provided on a bypass line 62 to prevent a reverse current flow through the DC motor.
  • a pulse width modulator control circuit 64 such as Model CS-5560 produced by Cherry Semiconductor of East Greenwich, R.I.
  • a voltage source V limit DAC is applied at line 66 to one leg of a comparator 68 while the other leg of the comparator is connected to a line 70 which, through a relatively small resistance 72 thereby measuring the current flowing to the motor.
  • the comparator 68 acts as a switch and, the output signal of the comparator is supplied to port 11 of the control circuit 64 which is a current limiting port which affects the output of the control circuit at port 14.
  • the voltage supplied at line 66 can be set at a relatively high amount to initiate the spinning program in order to overcome the initial at rest inertia of the wash basket and clothes load to bring the wash basket up to a first minimum rotational speed.
  • the voltage can be reduced such that a lower current is supplied to the motor for the various acceleration steps. It is not necessary that the current supplied to the motor at various speed levels be maintained constant, however it is necessary for the current level supplied to the motor to remain constant at a given speed level.
  • a reference voltage V cc is utilized at a number of locations in the circuit, being supplied to port 1 as a reference voltage for the control circuit 64, through a resistance to port 15 and to provide an internal voltage at line 74 to a potentiometer 76 used in determining the rotational speed of the motor shaft.
  • a voltage V tach which may be obtained as an output voltage of a tachometer attached to the motor shaft, is applied to line 78 and which passes through an amplifier and filter circuit 80 and is summed with the reference voltage V offset at comparator 82.
  • An alternate means of measuring the speed of the motor can be to tap directly into the back EMF of the motor rather than utilizing a separate tachometer.
  • a second leg of comparator 82 is supplied with a voltage V set DAC which is a voltage designed to set the particular rotational speed to be obtained by the rotating motor shaft.
  • V set DAC is a voltage designed to set the particular rotational speed to be obtained by the rotating motor shaft.
  • the entire control circuit 64 can be turned off by an appropriate signal on line 88 to port 10.
  • the circuitry of FIG. 4 illustrates one embodiment of a means for controlling the motor speed to operate the motor at various speed levels, between high and low limit speeds at those levels through an appropriate voltage signal V set DAC and to control the current to the motor through an appropriately selected voltage signal V limit DAC.
  • An external circuit such as a micro computer with a timer is utilized to measure the time required to accelerate from a given low limit speed to a given high limit speed at each speed level and is utilized to provide the desired voltage signals V set DAC and V limit DAC.
  • FIG. 5 is a flow chart diagram illustrating the steps undertaken during the method disclosed herein.
  • a clock is started at a time zero.
  • the speed level set points are set for M representing a minimum speed at 1 and N representing a maximum speed at 2.
  • a current level I is set at a maximum limit and a counter P is set at 1.
  • Control is then passed to control unit 102 where armature voltage is set at a level equal to current I times resistance of the armature Ra plus a voltage E equal to the back EMF voltage of the motor. Motor speed is then read and stored as variable W which equals the back EMF voltage E divided by a motor speed constant K v . Control is then passed to control unit 104 where the read motor speed W is compared to a minimum speed W(M) plus or minus a predetermined range limit. If the read speed is not substantially equal to the minimum speed W(M) then control is passed back to control unit 102 for a repetition of the reading until the minimum speed is attained.
  • control is passed to control unit 106 where it is determined if the motor speed W is greater than or equal to the maximum speed of the motor W max . If the motor speed is greater or equal to the maximum speed then control is passed to control unit 108 where the speed is held until a maximum spin time limit T max is reached.
  • control is passed to control unit 110 where the time at the minimum speed set point is stored as T(M), current I is set at an acceleration current I a and voltage is set at the current times the armature resistance plus the back EMF voltage of the motor.
  • Control is then passed to control unit 112 where the motor speed W is read, as was done in control unit 102.
  • Control is then passed to control unit 114 which compares the read motor speed with a maximum speed set point W(N) plus or minus a predetermined limit range. If the maximum speed set point has not been attained, control is passed back to control unit 112 for a repetition of steps in control unit 112 and 114 until the maximum speed set point is attained.
  • control is passed to control unit 116 where the time at the maximum speed set point is stored as T(N).
  • Control is then passed to control unit 118 in which acceleration at the current counter level P is calculated by the difference between the maximum speed set point W(N) minus the minimum speed set point W(M) divided by the time difference of the time at the maximum speed set point T(N) minus the time at the minimum speed set point T(M).
  • the counter is then incremented by 1 and control is passed to control unit 120 which compares the current acceleration A(P) with the most recent acceleration A(P-1) to determine if the current acceleration is greater than a predetermined limit amount. If the difference is greater than the limit then control is passed to control unit 122 where current is set to a current level during deceleration I d and control is passed back to control unit 102 to repeat the above described steps.
  • control unit 124 where the minimum and maximum set points are incremented to the next higher level. Then control is passed back to control unit 102 to repeat the above steps for the new levels.
  • control will first bring the basket up to an initial speed and start a timer and then will cause the basket to accelerate and decelerate in a first speed range until accelerations of the basket in two successive acceleration steps are substantially the same. Then the control will increment the speed range to a next higher level and again there will be a repetition of acceleration and decelerations until a substantially constant acceleration is sensed.
  • FIG. 6 graphically illustrates the significant improvement in operation provided by the present invention. This graphic illustration compares basket rotational speed, force on the clothes load and amount of water extraction which occurs in a presently available washing machine with identical parameters in a washing machine embodying the principles of the present invention.
  • the speed of the basket which is illustrated by the line designated 126, is caused to rapidly accelerate from zero up to some predetermined constant rate of approximately 700 rpm and the speed remains relatively constant during the entire extraction cycle.
  • the force on the clothes load is illustrated by line 128 and it is seen that it accelerates rapidly up to a peak amount just short of 300 lbs. from where it slowly tapers down to a level still above 250 lbs.
  • the peak in the force curve occurs when the speed of the basket reaches its highest level and it slowly decreases due to water being extracted from the clothes load. That is, as more water is extracted, the force on the clothes decreases.
  • curve 130 The amount of water extracted, in pounds, is illustrated by curve 130 which shows a fairly rapidly increasing amount of water being extracted as the speed of the basket accelerates towards its fixed upper speed and then the amount of incremental or additional water being extracted slowly tapers off until, at about 200-240 seconds, all of the water that is extractable has been extracted and the curve remains level.
  • the extraction step is continued for a predetermined period of time, independent of the moisture retaining quality of the clothes load. Thus, as illustrated, often the cycle continues despite the fact that no additional moisture is being extracted.
  • a speed curve is illustrated by a dashed line at 132 which shows a first acceleration up to a first speed range with a repetition of accelerations and decelerations resulting in a saw tooth speed curve at a first level, then an acceleration up to a second level with a second saw tooth representation and finally an acceleration up to a third level again with a saw tooth representation.
  • the amount of water extracted is illustrated by dashed curve 136 which shows that the amount of water extracted accelerates fairly rapidly and then begins to taper off during the first speed level.
  • dashed curve 136 shows that the amount of water extracted accelerates fairly rapidly and then begins to taper off during the first speed level.
  • a surprising result obtained by use of the present invention, and illustrated in this comparison is that although the speed of the basket is maintained below that of a speed attained in presently available washers, the amount of water extracted is actually higher while the force on the clothes load is held considerably below that of presently available machines. In the presently available machines the force on the clothes load remains at a very high level even when the water has been extracted to a large degree. However, by use of the present invention, the force is held at a relatively low level even though speed of the basket is increased to a relatively high level.
  • a control could be employed to cause the basket to accelerate to a first rotational speed for a given time period, then accelerate to a second speed level for a predetermined time period and to higher levels of speed for given time periods in accordance with empirically predetermined test results to achieve a result substantially identical to that described above although exact precision would not be attained in assuring that all of the moisture had been extracted at a given speed level or that termination of the operation occurred as soon as the maximum amount of moisture had been extracted for the highest speed level.
  • a further embodiment of the invention would be one in which the speed of the basket is slowly but constantly accelerated so that again most of the water would be extracted from the wash load at a relatively low basket speed, while permitting maximum moisture extraction by having a relatively high maximum basket rotational speed.
  • An alternative control could provide constant acceleration to the motor and measure the torque differences, rather than as discussed above by providing a constant torque and measuring the acceleration.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
US07/039,321 1987-04-16 1987-04-16 Water extraction method and control for automatic washer Expired - Lifetime US4782544A (en)

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US07/039,321 US4782544A (en) 1987-04-16 1987-04-16 Water extraction method and control for automatic washer
CA000563985A CA1306367C (fr) 1987-04-16 1988-04-13 Dispositif d'essorage et commande correspondante pour lessiveuse automatique

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US5000015A (en) * 1988-12-22 1991-03-19 Brother Kogyo Kabushiki Kaisha Washing and dehydrating machine
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GB2249847A (en) * 1990-08-28 1992-05-20 Toshiba Kk Clothes dehydrator
EP0589244A1 (fr) * 1992-09-25 1994-03-30 Bauknecht Hausgeräte GmbH Procédé pour surveiller et commander le déroulement du programme d'un appareil domestique
US5325677A (en) * 1992-08-27 1994-07-05 General Electric Company Electronic washer control including automatic balance, spin and brake operations
US5345637A (en) * 1993-04-27 1994-09-13 Whirlpool Corporation High performance washing system for a horizontal axis washer
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US5361439A (en) * 1993-10-12 1994-11-08 Speed Queen Company Method and apparatus for spinning and draining automatic clothes washer
EP0649931A1 (fr) * 1993-10-25 1995-04-26 Bosch-Siemens HausgerÀ¤te GmbH Procédé pour déterminer la masse de linge mouillé dans un tambour à linge
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US5979194A (en) * 1997-08-29 1999-11-09 Kabushiki Kaisha Toshiba Motor speed control for washing machine
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US20040006829A1 (en) * 2002-07-11 2004-01-15 Samsung Electronics Co., Ltd. Method of controlling a shoe washing process of a washing machine
US20040068804A1 (en) * 2002-10-10 2004-04-15 Kim Jin Woong Method for controlling dehydrating operation of drum type washing machine
US20040194226A1 (en) * 2002-12-28 2004-10-07 Kim Jong Ho Method for detecting dewatering load in washing machine and washing machine control method using the same
US20040221474A1 (en) * 2003-05-05 2004-11-11 Dennis Slutsky Combination washer/dryer having common heat source
US20040245953A1 (en) * 2003-06-04 2004-12-09 Peterson William A. Methods and apparatus for dynamically reconfiguring a pulse width modulation approach
US20050015890A1 (en) * 2003-07-23 2005-01-27 Lg Electronics Inc. Method and apparatus for detecting laundry weight of washing machine
US20050044640A1 (en) * 2003-08-26 2005-03-03 Hyeong Do Ki Washer and method of performing spinning operation
US20050102766A1 (en) * 2003-11-17 2005-05-19 Maytag Corporation Method and apparatus for spinning fabrics
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